Answer:
There is currently no direct way to determine the post-critical load. It is important that there are also several different states, and thus that there can be several local post-critical loads.
You can assign load increments to the structure and retroactively view the individual load increments, and thus find a load factor close to the post-critical failure (depending on the number of load increments).
In the attached model, 20 load increments and saving of the intermediate results have been set (Image 01). Image 02 shows Load Increment 10 as the last load increment before the post-critical failure, and Image 03 shows the first load increment after the post-critical failure, whereby the deformation is significantly higher.
